jev-mcp (BYK eval-first server)

Overview

BYK’s jev-mcp implements an eval-first MCP server for TypeSafe’s Jev System One model, surfacing judgments like `choice`, `score`, and `noul` along with probabilities rather than generative text.[5] It is designed to be plugged into MCP-capable IDEs and coding agents, turning Jev into a decision engine that can drive control flow. This is valuable for developers building robust, testable agent behavior where deterministic branching matters more than free-form responses.